For issues relating to the creation, use, and maintenance of code snippets.
A snippet is a small region of re-usable source code, machine code or text. Ordinarily, these are formally-defined operative units to incorporate into larger programming modules. Snippets are often used to clarify the meaning of an otherwise "cluttered" function, or to minimize the use of repeated code that is common to other functions.
Snippets can be created and used in many newer IDEs to insert a nearly functional code. With placeholders it is then possible to tab through the missing parts and fill in the variable names of other missing code parts.
For a fast practical use of a theoretical concept it is often preferred to show it on a snippet as an excerpt of the used code with the variable names foo and bar.